Since the detailed tax report uses the Q/I History Detail File, the date it sees is the detail date. Gridview reports from only one file, so it cannot see the invoice date which in the History Header File.

You could match the date for the details to the invoice date.

You could use Crystal Reports to draw fields from more than one file.

I have already made a request (and sent a sample) to Softrak to include a more detailed tax report in an upgrade, so it may be available in the future.